Driving mechanism for traversing cranes.



No. 687,633. Patented Nov. 26, I90]. 0. KAMMERER.

DRIVING MECHANISM FOR TRAVERSING CRANES.

(Application filed May 11, 1900.)

(No Model.)

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UNITED STATES,

PATENT OFFICE.

OTTO KAMMERER, OF OHARLOTTENBURG, GERMANY.

DRIVING MECHANISM FOR TRAVERSING CRANES.

SPECIFICATION forming part of Letters Patent No. 687,633, dated November 26, 1901.

Application filed May 11, 1900.

To all whom it may concern:

Be it known that I, O'r'ro KAMMERER, a subject of the King of Prussia, German Emperor, and a resident of 148 Berliner street, Charlottenburg, near Berlin, in the Kingdom of Prussia, German Empire, have invented a new and useful Driving Mechanism for Traversing Cranes, of which the following is an exact specification.

The driving mechanism for traversing cranes of a great span width is mostly arranged in such a manner that on one side of the crane-carrier a shaft is adapted in bearings, which is driven by a motor by means of a crank provided in the center of the shaft. This latter is connected with the traversing wheels of the carrier by means of cog-wheels arranged on the extremity of the shaft. It is of great importance that the rotating power of the shaft be equal on both sides of the crank; but this will only be the case as long as the crane-cart will stand in the center of the carrier or bridge. If the position of the trolley be changed, the load resistance and the acceleration resistance increase on the load side in proportion to the load distance from the endsviz. a :a'if the distance be a 03. Consequently the rotating resistance becomes also greater on this side. For this reason the movement of the bridge will not be uniform on both sides of the same when the cranecarrier possesses a great span width in proportion to a small load. j

A better form of construction is obtained in arranging the driving-motor on the trolley which drives the carrier by means of bevelwheels adapted in hearings to be moved together with the trolley. When the trolley is moved from the center position, the greater load resistance corresponds to the smaller rotating length of the shaft on the load sideviz. a, m -b :bi-if a and a are the distances of the motor from the driving-wheels and b b are the distances between the gearings. This construction, often employed for cranes with great span width, has the disadvantage that the same requires a square shaft and swing bearings, which elements get very quickly worn out. To do away with these drawbacks, I employ a new arrangement Serial No. 16,390. (No model.)

which forms the subject-matter of my invention.

In order to make my invention more clear, I refer to the accompanying drawing, in which similar letters denote similar parts and which represents a diagram of my new construction.

The motor is arranged on the trolley c and drives two rope-drums n and 0, which are mounted on the trolley and receive four ropes 19, (1,13 and s. The latter are adapted to wind up or 03 the drums. Two wire ropesp q run over pulleys t and u, arranged, respectively, on opposite ends of the carrier, and are anchored on one wall '0 of the shop, while the two other ropes r and 8 run over pulleys w 03, arranged, respectively, on opposite extremities of the carrier and are anchored on the other side of the wall y of the shop. If the winding of the ropes is carried out in the way shown in Fig. 3, so that when the ropes 19 and q are wound up and the ropes r and s wound off, the drums rotate in the same direction the carrier traverses the shop. If the rotation of both drums is in opposite direction, only the trolley will move along the carrier, while the latter will be in rest. Of course the winding of the ropes around the drums can be carried out in such a way that when the drum rotates in the same direction only the trolley will be moved, and vice versa. By means of this arrangement I obtain a uniform movement of the carrier and the trolley, for if the trolley is moved from its central position the shorter rope-piece is on the side of the greater traveling resistance. The stretching of both running rope-pieces will be uniform on the right as well as on the left hand from the drums. The load on and the length of the running rope-pieces are always in balancethat is, a:a ::b':b Thereby a and a are the distances of the load from the driving-wheels on both extremities of the carrier and b b are the length of the running rope-pieces on both sides of the drums.

Having now particularly described the na ture of my said invention, what I desire to secure by Letters Patent of the United States 1. In an improved driving mechanism for cranes, the combination of two drums arranged upon the trolley, with means for rotating these drumsand four ropes adapted to be wound up and off the drums and anchored to the walls of the shop, substantially as set forth. 2. In an improved driving mechanism for cranes, the combination of two drums arranged upon the trolley, with the motor arranged upon the trolley andadapted to rotate {0 these drums in either direction, four ropes adapted, to be wound up and oi the drums,

said ropes being anchored to thewells of the shop, substantially as and for the purpose set forth.

In witness whereofI haveher eunto set my 15 hand in presence of two witnesses.

OTTO KAMMERER.

\Vitnesses:

HENRY HASPER, WoLDEM-AR HAUPT. 

